I should have mentioned I dont like fish which have their mouths underneath them. (I don't know the scientific name) Apart from the clown loach atm.
are you kidding me?
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In this instance the dracaena that you have in your tank can survive with its roots in water but is only a marginal at best and really the stems need to be above the waterline for it to survive
It is actually also sold as a houseplant, and will live much happier/longer if kept that way,